// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#if V8_TARGET_ARCH_X64

#include "src/debug/debug.h"

#include "src/assembler.h"
#include "src/debug/liveedit.h"
#include "src/frames-inl.h"
#include "src/macro-assembler.h"
#include "src/objects-inl.h"

namespace v8 {
namespace internal {

#define __ ACCESS_MASM(masm)

    void DebugCodegen::GenerateHandleDebuggerStatement(MacroAssembler* masm)
    {
        {
            FrameScope scope(masm, StackFrame::INTERNAL);
            __ CallRuntime(Runtime::kHandleDebuggerStatement, 0);
        }
        __ MaybeDropFrames();

        // Return to caller.
        __ ret(0);
    }

    void DebugCodegen::GenerateFrameDropperTrampoline(MacroAssembler* masm)
    {
        // Frame is being dropped:
        // - Drop to the target frame specified by rbx.
        // - Look up current function on the frame.
        // - Leave the frame.
        // - Restart the frame by calling the function.

        __ movq(rbp, rbx);
        __ movq(rdi, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
        __ leave();

        __ LoadTaggedPointerField(
            rbx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
        __ movzxwq(
            rbx, FieldOperand(rbx, SharedFunctionInfo::kFormalParameterCountOffset));

        ParameterCount dummy(rbx);
        __ InvokeFunction(rdi, no_reg, dummy, dummy, JUMP_FUNCTION);
    }

    const bool LiveEdit::kFrameDropperSupported = true;

#undef __

} // namespace internal
} // namespace v8

#endif // V8_TARGET_ARCH_X64
